Abstract
In this experiment, sub1A quantitative trait loci (sub1A QTL) of rice were evaluated for dehydration responses through different aspects of cellular responses. Through variations of dehydration exposure, rice seedlings recorded a significant increase in superoxide (O2.-) and hydrogen peroxide (H2O2), the former by 1.80 fold and the latter by 2.10 fold. Nicotinamide adenine dinucleotide phosphate oxidase activity fairly correlated with lipid peroxidation (r = 1.96). Both 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) had similar IC50 values over the control at p ? 0.05. Reducing power of the extract had 1.31 fold increase. The antioxidant moieties like total phenolics and flavonoids were 1.04 and 1.23 fold upregulated under stress. On the other hand anthocyanin and glutathione (GSH) did not vary much under stress except at maximum duration of stress. Superoxide dismutase (SOD) was initially stable but maximized at 8 days by 1.30 fold increase. On the contrary, guaiacol peroxidase (GPX) was seen to be downregulated by 40.94% all through the days of stress. Catalase (CAT) activity followed a similar trend, but was not significant as compared to control.
Highlights
In reaction to submergence stress, few rice genotypes have the unique ability to sustain under partial to complete inundation for variable periods of time
On the other hand content of H2O2 was more upregulated with significant upregulation against control regardless of treatment duration (Fig. 1b)
Sub1A QTL was less responsive under sufficient soil-moisture condition
Summary
In reaction to submergence stress, few rice genotypes have the unique ability to sustain under partial to complete inundation for variable periods of time This is exhibited by a few landraces like FR13A, FR13B that show the ability to withstand hypoxic / anoxic condition and its post period effects by different mechanisms (1). The most determining factor in declaring a rice gentoype submergence tolerance is its capacity to handle post submergence stress This includes oxygenic tension and intense irradiance when plants encounter when water level recedes. Swarna Sub[1] can be sensitized with elevated redox related stress responses of inundation (5) It is an inherent character of landraces possessing sub1A QTL like elements to realize adequate growth and yield under varying depths of submergence. The objective of the study was to document the response of, landraces of rice possessing the sub1A QTL, to delayed or erratic rainfall pattern
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
